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Douvilleiceratidae
Douvilleiceratidae is a family of ammonites. These fast-moving nektonic carnivores lived in the Cretaceous from 125.45 to 94.3 Ma. Its fossils have been found in Angola, Brazil, Canada, Colombia, the Dominican Republic, France, Germany, India, Iran, Italy, Japan, Madagascar, Mexico, Morocco, Peru, South Africa, Spain, Switzerland, Russia, the United Kingdom, United States and Venezuela. Subfamilies and genera * Cheloniceratinae Spath, 1923 ** '' Cheloniceras'' Hyatt, 1903 ** '' Procheloniceras'' Spath, 1923 * Douvilleiceratinae Parona and Bonarelli, 1987 ** ''Douvilleiceras ''Douvilleiceras'' is a genus of ammonites from the Cretaceous, Middle to Late Cretaceous. Its fossils have been found worldwide, in Africa, Asia, Europe, and North America, North and South America. Description Shells of ''Douvilleiceras inaequi ...'' Grossouvre, 1894 * Roloboceratinae Casey, 1961 ** '' Roloboceras'' References Ammonitida families Ancyloceratina Cretaceous ammonites {{Cr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Douvilleiceras
''Douvilleiceras'' is a genus of ammonites from the Middle to Late Cretaceous. Its fossils have been found worldwide, in Africa, Asia, Europe, and North and South America. Description Shells of ''Douvilleiceras inaequinodum'' can reach a diameter of about . Species Species within the genus ''Douvilleiceras'' include: * ''D. clementium'' * ''D. inaequinodum'' (Quenstedt, 1849) * ''D. mamillare'' * ''D. mammillatum'' (Schlotheim, 1813) * ''D. meyendorffi'' * ''D. monile'' (Sowerby, 1836) * ''D. muralense'' Stoyanow 1949 * ''D. offarcinatum'' * ''D. orbignyi'' Hyatt, 1903 * ''D. scabrosum'' * ''D. solitae'' * ''D. spiniferum'' (Whiteaves, 1876) Distribution Fossils of ''Douvilleiceras'' are found in the Cretaceous of Angola, Brazil, Canada, Colombia ( Capotes Formation, Cundinamarca),Acosta & Garay, 2002, p.42 the Dominican Republic, Egypt, France, Iran, Japan, Madagascar, Mexico, Peru, South Africa, Switzerland, the former USSR, the United Kingdom, Alaska and Texas. ''D. inaeq ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ancyloceratina
The Ancyloceratina were a diverse suborder of ammonite most closely related to the ammonites of order Lytoceratina. They evolved during the Late Jurassic but were not very common until the Cretaceous period, when they rapidly diversified and became one of the most distinctive components of Cretaceous marine faunas. They have been recorded from every continent and many are used as zonal or index fossils. The most distinctive feature of the majority of the Ancyloceratina is the tendency for most of them to have shells that are not regular spirals like most other ammonites. These irregularly-coiled ammonites are called heteromorph ammonites, in contrast to regularly coiled ammonites, which are called homomorph ammonites. Biology The biology of the heteromorph ammonites is not clear, but one certainty is that their uncoiled shells would have made these forms very poor swimmers. Open shells, particularly ones with spines and ribs, create a lot of drag; but more importantly, the orient ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Family (biology)
Family ( la, familia, plural ') is one of the eight major hierarchical taxonomic ranks in Linnaean taxonomy. It is classified between order and genus. A family may be divided into subfamilies, which are intermediate ranks between the ranks of family and genus. The official family names are Latin in origin; however, popular names are often used: for example, walnut trees and hickory trees belong to the family Juglandaceae, but that family is commonly referred to as the "walnut family". What belongs to a family—or if a described family should be recognized at all—are proposed and determined by practicing taxonomists. There are no hard rules for describing or recognizing a family, but in plants, they can be characterized on the basis of both vegetative and reproductive features of plant species. Taxonomists often take different positions about descriptions, and there may be no broad consensus across the scientific community for some time. The publishing of new data and opini ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ammonite
Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more closely related to living coleoids (i.e., octopuses, squid and cuttlefish) than they are to shelled nautiloids such as the living ''Nautilus'' species. The earliest ammonites appeared during the Devonian, with the last species vanishing during the Cretaceous–Paleogene extinction event. Ammonites are excellent index fossils, and linking the rock layer in which a particular species or genus is found to specific geologic time periods is often possible. Their fossil shells usually take the form of planispirals, although some helically spiraled and nonspiraled forms (known as heteromorphs) have been found. The name "ammonite", from which the scientific term is derived, was inspired by the spiral shape of their fossilized shells, which somewhat resemble tightly coiled rams' horns. Pliny the Elder ( 79 AD near Pomp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cretaceous
The Cretaceous ( ) is a geological period that lasted from about 145 to 66 million years ago (Mya). It is the third and final period of the Mesozoic Era, as well as the longest. At around 79 million years, it is the longest geological period of the entire Phanerozoic. The name is derived from the Latin ''creta'', "chalk", which is abundant in the latter half of the period. It is usually abbreviated K, for its German translation ''Kreide''. The Cretaceous was a period with a relatively warm climate, resulting in high eustatic sea levels that created numerous shallow inland seas. These oceans and seas were populated with now- extinct marine reptiles, ammonites, and rudists, while dinosaurs continued to dominate on land. The world was ice free, and forests extended to the poles. During this time, new groups of mammals and birds appeared. During the Early Cretaceous, flowering plants appeared and began to rapidly diversify, becoming the dominant group of plants across the Earth b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fossil
A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved in amber, hair, petrified wood and DNA remnants. The totality of fossils is known as the ''fossil record''. Paleontology is the study of fossils: their age, method of formation, and evolutionary significance. Specimens are usually considered to be fossils if they are over 10,000 years old. The oldest fossils are around 3.48 billion years old to 4.1 billion years old. Early edition, published online before print. The observation in the 19th century that certain fossils were associated with certain rock strata led to the recognition of a geological timescale and the relative ages of different fossils. The development of radiometric dating techniques in the early 20th century allowed scientists to quantitatively measure the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Albert De Grossouvre
Marie Félix Albert Durand de Grossouvre (23 August 1849, Bourges – 18 May 1932, Bourges) was a French geologist, best known for his research in the fields of stratigraphy and paleontology. Biography He studied at the École Polytechnique and the École des Mines de Paris, and afterwards worked as a mining engineer in his hometown of Bourges. In 1889 he attained the post of chief mining engineer. He conducted stratigraphic investigations throughout France, and in the process, uncovered numerous fossils, most notably ammonites. As a cartographer, he participated in the creation of geological maps of central France (Issoudun, Châteauroux, Valençay).Sociétés savantes de France biography in French at Annal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
